Sewer drain



July 19, 1932- J. E SIMPSON S EWER DRAIN Filed Jan. 27, 1931 2 Sheets-Sheet l Jrwm-u JOHN E. s IMPS ON,

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July 19, 1932- J. E. SIMPSON S EWER DRAI N Filed Jan. 27, 1931 2 Sheets-Sheet 2 Jmm I ESIMPSON,

Patented July 19, 1932 UNITED STATES JOHN E. SIMPSON, OF PORTSMOUTH, OHIO SEWER DRAIN Application filed January 27, 1931. Serial No. 511,5{51Q This invention relates to sewer drains, and has for its object to provide, in connection with a drain and a manhole therein, a trap door adapted to be operated by an accumula- 6 tion of water above the door.

It is particularly the object of this invention to provide, in connection with a sewer drain, a casing or housing which has on the upper surface thereof a manhole and a cover therefor, and beneath the cover a trap door adapted to be automatically closed, but that will readily open when the drain is flooded with water.

It is particularly the object of this inven- 5 tion to provide, in connection with a sewer drain with a manhole therein, means for closing the sewer drain so that gases, vapors and offensive odors formed in the sewer cannot escape through the drain into the streets and 29 open air.

These and other advantages will appear from the following description in connection with the drawings, in which there is shown a preferred embodiment of this invention.

Referring to the drawings:

Figure l is a top plan view of the sewer drain with the cover in place.

Figure 2 is a vertical transverse section through the drain showing the cover in place l and the trap door closed.

Figure 3 is a longitudinal horizontal section showing the trap door closed.

Figure 4 is a vertical transverse section through the drain showing the trap door open.

This invention relates to sewer drains and consists of a chamber having an outlet, and may be formed of four parts, a casing constituting an upper plate and walls, the upper plate having a manhole therein, a cover for the manhole, a lower plate forming with the walls and the upper plate the casing and having a hole therein in line with the manhole, and a trap door to close the hole in the lower plate.

The upper plate is indicated by the numeral 1 and has downwardly extending therefrom walls 2. These walls are substantially U-shaped and have one end 3 open to form W a drain opening at one side of the casing for receiving sewage and other drainage. In the upper platel is a manhole 4, closed by a removable cover 5. Attached to the walls and the upper plate is a lower or bottom plate 6, which has a hole therein inline with the manhole in the upper platel; This lower plate is attached to the upper plate and the walls by means of bolts 7 The hole in the lower plate in line with the manhole is indicated by the numeral 8.

i I At diammetrically-opposite points of the hole 8 in the bottom plate are seats 9 for receiving trunnions 10 on opposite sides of a trap door 11. By this means the trap door is supported in these seats by the trunnions OI so that it may rock on the trunnions. Onehalf or slightly more than one-half of the trap door is adapted to seat within the hole 8 and in a line with the upper surface of H this plate. The other part of the trap door is bent downward, as indicated by the numeral 12, to form with a circular, crescent- I shaped flange 13, formed on the under side of the bottom plate, a pocket 13 for holding an accumulation of water and other matter drained into the casing. This flange 13 is semi-circular in shape and extends down from the lower edge of the hole 8 from the lower plate 6, and is adapted to be contacted on its lower edge by the part 12 of the trap 8L door to form a closure.

In order that the trap door may be held in closed position, as shown in Figure 2, there is provided on the under side of the trap door, at the edge opposite the part 12, a 8i weight 14. This weight is suflicient to hold the trap door in closed position, as shown in Figure 2, but not so heavy but that the weight of the water andaccumulated sewage in the pocket may open the door against the weight, 99 as shown in Figure 4. The accumulation of water in the pocket 13' has a tendency to open the trap door by the pressure which overcomes the weighted side of the trap door, and when the accumulation of water and sewage on the part 12 has overcome the weight 14 the door will tip and let the water drain through the hole 8 into the sewer. When the water has entirely drained into the sewer the weight 14 of the trap door is released and the no position shown in Figure 2 is resumed thereby cutting off gases, vapors and o ensive odors from the sewer.

I desire to comprehend within my inven- 5 tion such modifications as may be embraced within my claim and the scope of my invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

In a drain apparatus for sewers, the combination comprising a casing forming a chamber having inlet and outlet openings approximately oppositely disposed, a crescentshaped flange extending down from the bottom plate of the chamber and a, seat along another part, an angular closure for said outlet opening pivoted to said bottom plateto rotate, part ofsaid closure being adapted to rest on said seat and another part of said closure being bent to engage the crescentshaped flange, whereby the outlet opening is closed, the bent part of the closure and the crescent-shaped flange forming a pocket for the accumulation of sewage so'that the closure may be tripped and the outlet opened thereby. I

In testimony whereof, I affix my signature.

, JOHN E. SIMPSON. 

